Gossen MetraWatt METRAHIT ONE Plus Operating instructions

Gossen MetraWatt
Brand
Gossen MetraWatt
Model
METRAHIT ONE Plus
Category
Measuring, testing & control
Type
Operating instructions
Operating Instructions
Analog-Digital Multimeter
3-349-236-03
1/1.03
ONE
METRA HIT
2 GOSSEN METRAWATT GMBH
1Display (LCD)
2 ON/OFF key
3 DATA key for the following functions: save measured value,
delete and MIN-MAX
4 AUTO/MAN key for manual measuring range selection
5 FUNC key for selecting ranges or functions
6 Rotary selector switch for measuring function
7 Connector jacks
Symbols used in the Digital Display
8 Symbol for continuous duty
9 Digital display with decimal point and polarity display
10 Display for manual measuring range selection and for storage of
measured and min-max values
11 Display for selected current type
12 Unit of measure display
13 Display in case of overranging
14 Pointer for analog display
15 Scale for analog display
16 Indicates that the negative analog display range has been exceeded
17 Low battery display
18 Indicates that the acoustic signals are active
19 Unit of measure °C for temperature measurement
1
2
3
4
5
6
7
Max.
600 V !
19
8
9
10 11
12
18
17
131416 15
GOSSEN METRAWATT GMBH 3
Table of Contents
Page
1 Safety Features and Precautions ...............................3
2 Initial Start-Up ............................................................4
3 Selecting Measuring Functions and Measuring
Ranges .......................................................................5
3.1 Activating the DC Measuring Ranges ....................................... 5
3.2 Automatic Measuring Range Selection ..................................... 5
3.3 Manual Measuring Range Selection ......................................... 5
3.4 Quick Measurements .............................................................. 5
4 LCD .............................................................................5
4.1 Digital Display ......................................................................... 5
4.2 Analog Display ........................................................................ 5
5 Measured Value Memory – DATA Function. ...............6
6
Saving Minimum and Maximum Values
– MIN/MAX Function ............................................................6
7 Voltage Measurement ................................................7
7.1 Transient Overvoltages ............................................................ 7
7.2 Voltage Measurements at Above 600 V .................................... 8
8 Current Measurement ................................................8
8.1 Measuring Alternating Current with (Clip-On) Current
Transformers .......................................................................... 9
8.1.1 Transformer Output: mA / A .................................................... 9
8.1.2 Transformer Output: V ............................................................. 9
9 Resistance Measurement .........................................10
10 Continuity and Diode Testing ...................................10
11 Temperature Measurement ......................................12
12 RS 232C Interface (with METRAHit ONE Plus only) ..13
13 Characteristic Values ...............................................14
14 Maintenance ............................................................18
14.1 Battery ................................................................................. 18
14.2 Fuses ................................................................................... 18
14.3 Housing ................................................................................ 18
15 Repair and Replacement Parts Service,
DKD Calibration Lab
and Rental Instrument Service .................................19
16 Guarantee .................................................................19
17 Product Support .......................................................19
1 Safety Features and Precautions
You have selected an instrument which provides you with a
high level of safety.
The analog-digital multimeter is manufactured and tested in
accordance with safety regulations DIN VDE 0411 and
IEC 61010–1 / DIN EN 61010–1 / VDE 0411–1. When used
for its intended purpose, safety of the operator, as well as
that of the instrument, is assured. Their safety is however not
guaranteed, if the instrument is used improperly or handled
carelessly.
In order to maintain flawless technical safety conditions, and to
assure safe use, it is imperative that you read the operating
instructions thoroughly and carefully before placing your instrument
into service, and that you follow all instructions contained therein.
In the interest of your own safety and in order to protect the
instrument, the multimeter is equipped with an automatic
socket blocking mechanism. This mechanism is linked to the
function selector switch and only allows access to those
jacks which are actually required for the selected function. It
also prevents the user from turning the selector switch to
impermissible functions after the measurement cables have
already been plugged in.
Observe the following safety precautions:
• The instrument may only be operated by persons who
are capable of recognizing contact hazards and taking
the appropriate safety precautions. Contact hazards exist
anywhere, where voltages of greater than 33 V RMS may
occur.
• Avoid working alone when taking measurements which
involve contact hazards. Be certain that a second person
is present.
• Maximum allowable voltage between any of the connector
jacks (7) and earth is 600 V, category III. Nominal voltage at
the system may not exceed 600 V. Voltage measurement
may only be performed with the selector switch set to the
V= or the V~ position.
• Be prepared for the occurrence of unexpected voltages
at devices under test (e.g. defective devices). For
example, capacitors may be dangerously charged.
• Make certain that the measurement cables are in flawless
condition, e.g. no damage to insulation, no interruptions
in cables or plugs etc.
• No measurements may be made with this instrument in
electrical circuits with corona discharge (high-voltage).
• Special care is required when measurements are made in
HF electrical circuits. Dangerous pulsating voltages may
be present.
• Measurements under moist ambient conditions are not
permitted.
• Be absolutely certain that the measuring ranges are not
overloaded beyond their allowable capacities. Limit values
can be found in the “Measuring Ranges” table in chapter
13, “Characteristic Values”.
4 GOSSEN METRAWATT GMBH
• All current measuring ranges are protected with fuses.
Maximum allowable voltage for the measuring current
circuit is 600 V in all “mA” and “A” ranges.
• We recommend using our KS30 measuring adapter,
available as an accessory, for hazard-free voltage
measurement in power installations with up to 1000 V. The
included internal resistor limits measuring current in the
event of excessive voltage and operator error, and
assures reliable quenching of active spark gaps. For
additional information refer to chapter 7.2, “Voltage
Measurements at Above 600 V”.
Warning!
The instrument may not be operated in explosive
atmospheres, or connected to intrinsically safe
electrical circuits.
Meanings of symbols on the instrument:
Warning concerning a source of danger
(attention: observe documentation)
Earth terminal
Continuous, doubled or reinforced
insulation
CSA approval mark applied for
Indicates EC conformity
CAT III
Maximum allowable voltage
between the
connector jacks (7) and earth is
600 V, category III
.
DKD Calibration Upon Request
Repair, Parts Replacement and Balancing
When the instrument is opened, voltage conducting parts
may be exposed. The instrument must be disconnected from
the measuring circuit before the performance of repairs, the
replacement of parts or balancing. If balancing, maintenance
or repair of a live open instrument is required, this may only
be carried out by trained personnel who are familiar with the
dangers involved.
Defects and Extraordinary Strains
If it may be assumed that the instrument can no longer be
operated safely, it must be removed from service and
secured against unintentional use.
Safe operation can no longer be relied upon:
• If the device demonstrates visible damage
• If the instrument no longer functions
• After lengthy periods of storage under unfavorable
conditions (e.g. humidity, dust, temperature), see
ambient conditions on page 17
2 Initial Start-Up
Battery
Your instrument us supplied with an installed 9 V flat-cell
battery in accordance with IEC 6 F22 or IEC 6 LR 61, and is
ready for operation. Be sure to refer to chapter 14.1, “Battery”,
before initial start-up, or after your device has been in storage for a
lengthy period of time.
Switching the Instrument On
➭ Press the ON/OFF key (2).
Power-up is acknowledged with an acoustic signal. As
long as the key is held depressed, all of the segments at
the liquid crystal display (LCD) are illuminated. The LCD is
shown in the diagram on page 2.
The instrument is ready for use as soon as the key is
released.
Note!
☞
Electrical discharge and high frequency interference
may cause incorrect displays to appear, and may
disable the measuring sequence. In such cases,
switch the instrument off and back on again in order
to reset. If the problem persists, briefly dislodge the
battery from the connector contacts.
Disconnect the instrument from the measuring circuit before
opening and refer to chapter 14, “Maintenance”!
Automatic Shutdown
The instrument switches itself off automatically if the
measured value remains constant for a period of
approximately 10 minutes (measured value fluctuation ≤±2
digits), assuming that none of the keys or the rotary selector
switch are activated during this time. However, it is not
switched off if a current measuring range has been selected
and a measured value of greater than 30 digits is displayed.
Disabling Automatic Shutdown
The instrument can be set to continuous duty. Press the
multifunction key (5) and the ON/OFF key (2) simultaneously
when switching the instrument on to this end. Continuous
duty is indicated at the LCD by means of the symbol (8).
Switching the Instrument Off
Press the ON/OFF key (2).
!
Consecutive number
Registration number
Date of calibration (year – month)
German Calibration Service– calibration laboratory
B0730
01-04
DKD-K-
19701
GOSSEN METRAWATT GMBH 5
3 Selecting Measuring Functions and Measuring Ranges
The function selector switch (6) is linked to the automatic
socket blocking mechanism, which only allows access to two
connector jacks for each function. Be certain to remove the
appropriate plug from its respective jack before switching to
and from the “mA” or the “A” function. The socket blocking
mechanism prevents the user from inadvertently turning the
selector switch to impermissible functions after the
measurement cables have been plugged in to the instrument.
3.1 Activating the DC Measuring Ranges
The DC measuring ranges are not activated automatically
when the instrument is switched on. They must be activated
separately if they are required for the measurement to be
performed.
➭ Set the rotary selector switch (6) to .
➭ Briefly press the multifunction key (5).
The multimeter acknowledges initialization of offset
balancing for the DC measuring ranges with an acoustic
signal. “CAL ” appears at the digital display (9) during
internal balancing.
➭ Wait until the “CAL ” display is cleared from the LCD. The
DC measuring ranges are now active. They remain active
until the instrument is switched off, either automatically or
manually.
Note:
Automatic shutdown is disabled in all current measuring
ranges if the measured value display exceeds 30 digits.
➭ Set the rotary selector switch (6) to the desired position.
3.2 Automatic Measuring Range Selection
The multimeter is equipped with automatic measuring range
selection for all ranges except the 30 mV , 300 mV and
10 A ranges. Auto-ranging is active as soon as the
instrument is switched on. The instrument automatically
selects the measuring range which allows for highest
possible resolution of the applied quantity. If the instrument is
switched to frequency measurement and continues to
perform proportional measurement, the previously selected
voltage measuring range remains active.
The instrument is automatically switched to:
3.3 Manual Measuring Range Selection
Auto-ranging can be deactivated and measuring ranges can
be selected manually in accordance with the following table.
Manual operation is deactivated by pressing and holding the
AUTO/MAN key (4) (approx. 1 s), by activating the rotary
selector switch (6), or by switching the instrument off and
then back on again.
If the instrument is switched back to auto-ranging in the 30
mV or the 300 mV range, the 3 V range is selected
automatically.
1) If the respective measuring ranges are active
3.4 Quick Measurements
Measurements performed using a suitable fixed measuring
range are executed more quickly than those which utilize
automatic range selection. Quick measurement is made
possible with the following two functions:
• Manual measuring range selection, i.e. selection of the
measuring range with best resolution (see chapter 3.3)
or
•With the DATA function (see chapter 5). In this way, the
correct measuring range is selected automatically after
the first measurement and the second measurement is
executed more quickly.
The selected measuring range remains active for the
subsequent series of measurements with these two
functions.
4LCD
4.1 Digital Display
The measured value with decimal and plus or minus sign
appears at the digital display (9). The selected unit of
measure (12) and the current type (11) are displayed as well.
A minus sign appears to the left of the value during the
measurement of zero-frequency quantities, if the plus pole of
the measured quantity is applied to the “⊥” input. “OL” is
displayed if the upper range limit of 3099 is exceeded (or
1999 in the range).
The digital display is refreshed twice per second during V, A
and Ω measurements.
4.2 Analog Display
The analog display with simulated pointer and the same
dynamic performance as a moving-coil mechanism is
refreshed 20 times per second during V, A and Ω
– The next highest range at ± (3099 digits + 1 digit)
– The next lowest range at ± (240 / 280 digits – 1 digit)
From the 300 mA to the 3 mA range at ± (24 digits – 1 digit)
if the DC ranges are not activated in accordance with chapter 3.1.
⇓
AUTO/
MAN
(4)
Function
Acknowledge-
ment
Dis-
play
Acou-
stic
Signal
brief
Manual mode active:
utilized measuring range is fixed
MAN
(10)
1 x
brief
Range switching sequence for:
V : 3V→ 30 V → 300 V → 600 V → 30 mV → 300 mV
→ 3V→ ...
V/:3V→ 30 V → 300 V → 600 V → 3V→ ...
mA : 300 µA
1)
→ 3mA→ 30 mA
1)
→ 300 mA →
300 µA
...
mA / :3 mA → 300 mA → 3mA
...
A : 3A
1)
→ 10A → 3A
1)
...
Ω :30MΩ→ 30 Ω→ 300 Ω→ 3kΩ→ 30 kΩ→
300kΩ→ 3MΩ→ 30 MΩ ...
MAN
(10)
1 x
long Return to automatic range selection — 2 x
6 GOSSEN METRAWATT GMBH
measurements. This display is especially advantageous for
observing measured value fluctuation, and for balancing
procedures.
The analog display has its own polarity indicator. The analog
scale (15) has a negative range of 5 scale divisions for the
measurement of zero-frequency quantities, allowing for
precise observation of measured value fluctuation around
zero. If the measured value exceeds the display range, the
triangle at the left (16) is displayed first, and polarity at the
analog display is then switched after approximately 0.7
seconds. Overranging is indicated by the triangle at the right
(13) (> 3099 digits, or > 1999 in the range).
5 Measured Value Memory – DATA Function.
Measured values can be automatically “frozen” with the DATA
function. This is useful, for example, when contacting the
measuring points with the test probes requires your full
attention. After the measured value has been applied and the
corresponding “condition” from the table below has been
fulfilled, the measured value is frozen at the digital display and
an acoustic signal is generated. The test probes can now be
removed from the measuring points, and the measured value
can be read from the digital display. If the measured value is
less than the value specified in the table, the instrument is
reactivated for storage of the next value.
The DATA function has no effect on the analog display, at
which the current measured value continues to appear.
However, when the digital display if “frozen”, the decimal
point is fixed as well. If automatic range selection is activated,
you are thus no longer able to determine which range the
analog display is using. Manual range selection is not
possible as long as the DATA function is active.
1) Reactivation results from falling short of specified measured value limits.
2) Except 30 mV and 300 mV ranges
3) 240/280 digits, if the 300 µA, 30 mA, and 3 A ranges have been activated in
accordance with chapter 3.1.
The DATA function is deactivated by pressing and holding the
DATA key (3) (approx. 1 s), by activating the rotary selector
switch (6), or by switching the instrument off and then back
on again.
6 Saving Minimum and Maximum Values – MIN/MAX Function
Minimum and maximum measured values applied to the
measuring instrument’s input after the min-max function has
been activated can be “frozen” at the display. The most
important use of this function is the determination of
minimum and maximum values during long-term measured
value observation.
The min-max function has no effect on the analog display, at
which the current measured value continues to appear.
Connect the measured quantity to the instrument and select
the appropriate measuring range before activating the min-
max function.
Measuring ranges can only be selected manually after the
min-max function has been activated. However, saved
minimum and maximum values are cleared if the measuring
range is switched.
The min-max function is deactivated by pressing and holding
the DATA key (3) (approx. 1 s), by activating the rotary
selector switch (6), or by switching the instrument off and
then back on again.
DATA
Function
⇓
DATA
MIN/MAX
(3)
Condition
Response from
Instrument
Measuring
Ranges
Measured
Value
Limits
(digits)
Display
Acoust.
Signal
Digital
Meas.
Value
DATA
Activate brief blinks 1 x
Save
V
2)
A
Ω
>280
>24
3)
<OL
is dis-
played
is dis-
played
1 x
Reactivate
1)
V
2)
A
Ω
<280
<24
3)
OL
stored
meas.
value
blinks
Stop long
is
cleared
is
cleared
2 x
Function
MIN/MAX
⇓
DATA
MIN/
MAX
(3)
Meas.
Range
Min. and Max.
Measured
Values
Response from
Instrument
Display
Acou-
stic
Sig-
nal
Digital
Meas.
Value
MIN
MAX
1.
Activate and
save
2 x brief
30 mV/
300 mV
and °C :
1 x brief
V
A
Ω, °C
are
saved
Current
meas.
value
MIN and
MAX
blink
1 x
2.
Save and
display
brief
V
A
Ω, °C
Storage continues
in background,
new min. and
max. values are
displayed.
Saved
min.
value
MIN 1 x
brief
Saved
max.
value
MAX 1 x
3.
Return to 1
brief
Same
as 1
Same as 1,
stored values are
not deleted
Same as
1
Same
as 1
1 x
Stop long are deleted
is
deleted
is
deleted
2 x
GOSSEN METRAWATT GMBH 7
7 Voltage Measurement
➭ Depending upon the voltage to be measured, set the
rotary selector switch (6) to V
or V .
➭ Connect the measurement cables as shown. The “⊥”
connector jack should be grounded.
Note!
☞
The 30 mV and 300 mV measuring ranges can
only be selected manually with the MAN/AUTO key (4)!
An intermittent acoustic signal warns the operator if
the measured value exceeds 1000 V in the 600 V
range.
Attention!
!
Make sure than none of the current measuring ranges
(neither “mA” nor “A”) are activated when connecting
the multimeter for the performance of voltage
measurements! If fuse trip limits are exceeded as a
result of operator error, both the operator and the
instrument are in danger!
Zero Balancing in the 30 mV Measuring Range
Zero balancing is possible in the 30 mV measuring range:
➭ Plug the measuring cables into the instrument and
connect the free ends to each other.
➭ After selecting the measuring range, briefly press the
multifunction key (5).
The instrument acknowledges zero balancing with an
acoustic signal, and “00.00 ” (+ 1 digit) appears at the LCD
with blinking decimal point. The voltage displayed at the
moment the key is pressed serves as a reference value (max.
± 200 digits). It is automatically subtracted from all
subsequent measured values.
Zero balancing can be deleted:
– By pressing and holding the multifunction key (5), which
is acknowledged with two acoustic signals
– By switching the instrument off
7.1 Transient Overvoltages
The multimeter is protected against transient overvoltages of
up to 6 kV with rise times of 1.2, and halftimes of 50 µs. For
measurements at transformers or motors with long pulse
durations etc., we recommend the use of our KS30
measuring adapter. It provides protection against transient
overvoltages of up to 6 kV with rise times of 10, and halftimes
of 1000 µs. It has a continuous load capacity of 1200 V
RMS
.
Additional influence error caused by the KS30 measuring
adapter amounts to approximately –2%.
MAN
AUTO
brief
V=
– (+)
+ (–)
max. 600 V
V=: 0.01 mV … 600 V
Measuring Ranges:
!
3V→ 30 V
30 V → 300 V
300 V → 600 V
600 V → 30 mV*
30 mV → 300 mV*
300 mV → 3V
* Manual only
> 1000 V:
20.00
V
MAN
AUTO
brief
V~
Max. 600 V (1 kHz)
V~: 1mV … 600 V
Hz: 30 Hz … 1kHz
Measuring Ranges:
20.00
V
~
!
3V→ 30 V
30 V → 300 V
300 V → 600 V
> 1000 V:
8 GOSSEN METRAWATT GMBH
7.2 Voltage Measurements at Above 600 V
Voltages of greater than 600 V can be measured with a high-
voltage probe, e.g. the HV3
1)
of the HV30
2)
from GOSSEN
METRAWATT GMBH. It is absolutely essential to ground the
bonding terminal. Observe all applicable safety precautions!
1)
HV3: 3 kV
2)
HV30: 30 kV, for direct voltage only:
8 Current Measurement
➭ First disconnect supply power from the measuring circuit
or the consuming device, and discharge any included
capacitors.
➭ Activate the DC measuring ranges as described in
chapter 3.1.
➭ Select the A range with the rotary selector switch (6)
for current greater than 300 mA, or the mA range for
current less than 300 mA. Activate the highest measuring
range first when measuring current of an unknown
magnitude.
➭ Select the current type appropriate for the measured
quantity by briefly pressing the multifunction key (5). Each
time the key is pressed, DC and AC are alternately
selected, and switching is acknowledged with an
acoustic signal. The selected current type is indicated at
the LCD by means of the DC and AC symbols (11).
DC current is always active immediately after range
selection with the rotary switch (6). The instrument can
always be switched to DC by pressing and holding the
multifunction key (5), which is acknowledged with two
acoustic signals.
➭ Securely connect the measuring instrument to the
consuming device in series as shown (without transfer
resistor).
Voltage Measurements at Above 600 V
with the HV3 High-Voltage Probe
black
black
red
x1000
x100
FUNC
brief
DC → AC~
AC~ → DC
1x
A
3A/10A
!
00.00
A
Current
~ ~
1
3
2
A: 1 mA … 10.00 mA
Measuring Range:
MM
>10A:
!
0.000
A
DC
DC
AC~
GOSSEN METRAWATT GMBH 9
Notes Regarding Current Measurement:
• The instrument may only be used in power installations if
the electrical circuit is protected with a 20 A fuse or circuit
breaker, and the nominal voltage of the installation does
not exceed 600 V.
• The measuring circuit must be mechanically stable, and
must be secured against accidental interruption. Select
conductor cross-sections and connectors such that no
overheating occurs.
• An intermittent acoustic signal warns the operator if the
measured value exceeds the upper range limit in the
300 mA and 10 A measuring ranges.
• Measuring ranges up to 300 mA are protected against
short-circuit current of up to 25 A with an FF 1.6 / 700 V
fuse link in combination with power diodes. The fuse has
a breaking capacity of 50 kA at a nominal voltage of
700 V and ohmic load.
• The 3 A and 10 A current measuring ranges are
protected with a 16 A / 600 V fuse link. The fuse has a
breaking capacity of 100 kA at a nominal voltage of
600 V and ohmic load.
• If one of the fuses blows, this condition is indicated at the
LCD as soon as a measured quantity with a voltage of
greater than 4 V is applied to the corresponding
connector jacks. FUSE appears at the digital display (9)
in this case.
• If a fuse blows, eliminate the cause of overload before
placing the instrument back into service!
• Refer to chapter 14, “Maintenance”, regarding fuse
replacement.
8.1 Measuring Alternating Current with (Clip-On) Current
Transformers
8.1.1 Transformer Output: mA / A
Attention!
!
If current transformers are operated without being
connected at the secondary side (e.g. as a result of
defective or missing cables, a blown device fuse or
incorrect connection), dangerously high voltages
may occur at the connector jacks. For this reason,
make sure that the measuring instrument’s current
path and the transformer’s secondary coil connected
to the instrument complete an uninterrupted circuit,
and connect this circuit to the ⊥ and mA or A jacks.
Maximum allowable operating voltage is equal to the current
transformer’s nominal voltage. Do not forget to consider the
transformer’s transformation ratio and additional display error
when reading measured values.
8.1.2 Transformer Output: V
Some transformers are equipped with a voltage output
(designation: mV/A). The secondary terminals must thus be
connected to ⊥ and V.
FUNC
brief
mA: 100 nA … 300.0 mA
Measuring Range:
mA
... 300 mA
0.000
mA
~
R
x
~
R
x
1
3
2
> 300 mA:
!
Current
DC → AC~
AC~ → DC
1x
~
R
x
~
R
x
1
3
Current
V~
05.00
V
Z13B
2
10 GOSSEN METRAWATT GMBH
9 Resistance Measurement
➭ Make sure that the device under test is voltage-free.
Interference voltages distort measurement results!
➭ Set the rotary selector switch (6) to Ω.
➭ Connect the device under test as shown.
Zero Balancing in the 30 Ω Measuring Range
Cable and contact resistances can be eliminated for the
measurement of small resistance values in the 30 Ω range by
means of zero balancing:
➭ Plug the measuring cables into the instrument and
connect the free ends to each other.
➭ Briefly press the multifunction key (5).
The instrument acknowledges zero balancing with an
acoustic signal, and “00.00” (+1 digit) appears at the LCD
with blinking decimal point. The resistance value
measured at the moment the key is pressed serves as a
reference value (max. 200 digits). It is automatically
subtracted from all subsequent measured values.
Zero balancing can be deleted:
– By pressing and holding the multifunction key (5), which
is acknowledged with two acoustic signals
– By switching the instrument off
10 Continuity and Diode Testing
➭ Make sure that the device under test is voltage-free.
Interference voltages distort measurement results!
➭ Set the rotary selector switch (6) to .
➭ Connect the device under test as shown.
0.5
kΩ
Ω
R
x
Ω: 10 mΩ … 30 MΩ
Measuring Range:
+–
R
x
0V !
!
0.000
V
0.654
0L
Conducting Direction
Reverse Direction
GOSSEN METRAWATT GMBH 11
Conducting Direction and Short-Circuit:
The instrument displays conducting-state voltage in volts. As
long as voltage drop does not exceed the maximum display
value of 1999 V, several series connected components or
reference diodes can be tested with a small reference
voltage.
Reverse Direction or Interruption:
The measuring instrument indicates overflow: “OL”.
Note!
☞
Resistors and semiconductors which are connected
in parallel to the diode distort measurement results!
Continuity and Diode Testing with Acoustic Signal
If the “acoustic signal” function is activated, a continuous
acoustic signal is generated by the instrument within a
display range of 0 to approximately 1 V.
Acoustic Signal ON:
➭ Briefly press the multifunction key (5).
Activation is acknowledged with an acoustic signal. The
symbol (18) appears at the display as well.
Acoustic Signal OFF:
➭ Briefly press the multifunction key (5) once again.
Deactivation is acknowledged with an acoustic signal.
The symbol (18) is cleared from the display.
The acoustic signal function is always inactive immediately
after the “continuity and diode testing” function has been
selected with the rotary selector switch (6). The acoustic
signal can be activated and deactivated by repeatedly
pressing the multifunction key (5). If the key is pressed and
held the acoustic signal is deactivated, which is
acknowledged with two acoustic signals.
FUNC
brief
0.3
0V !
Continuity
R < 10 Ω
!
V
12 GOSSEN METRAWATT GMBH
11 Temperature Measurement
The multimeter provides for the measurement of temperature
within a range of – 200 (– 100) °C to + 850 °C with the help of
Pt100 and Pt1000 temperature sensors.
➭ Set the rotary selector switch (6) to Ω.
➭ Connect the sensor to the two accessible jacks.
➭ Briefly press the multifunction key (5).
The device is switched to temperature measurement,
automatically recognizes the utilized type of sensor
(Pt100 or Pt1000) and displays the measured
temperature in °C at the digital display.
Note!
☞
Cable resistances of temperature sensors available
as accessories are compensated for automatically
during temperature measurement. Switching to
temperature measurement is not possible if the 30 Ω
resistance measuring range has been selected!
Compensation of Sensor Cable Resistances of up to 50 Ω
Sensor cables with resistance values other than 100 mΩ can
be compensated for as follows up to a value of 50 Ω:
➭ Briefly press the multifunction key (5) once again.
The resistance value which will automatically be taken
into consideration by the instrument after the
temperature measuring range has been selected is now
displayed at the LCD. The “°C” symbol is displayed at the
same time in order to assure that the user recognizes the
displayed value as the resistance correction for the
temperature measuring range.
➭ The resistance correction value can be set as follows:
Press the DATA MIN/MAX key (3) in order to increase the
value, or the AUTO/MAN (4) key in order to reduce the
value. The value is changed by one digit each time the
respective key is pressed. Pressing and holding the
respective key results in rapid scrolling.
➭ Briefly press the multifunction key (5) once again.
Measured temperature is displayed at the LCD. The
blinking decimal point indicates that a cable resistance
correction value has been entered. The correction value
is retained until the instrument is switched off.
➭ Each time the multifunction key (5) is pressed, the display
alternates between the measured temperature value and
the cable resistance correction value.
The temperature measurement function can be exited:
– By pressing and holding the multifunction key (5), which
is acknowledged with two acoustic signals
– By switching the instrument off
Note!
☞
The multimeter which will actually be utilized to
perform temperature measurement must also be
used to determine cable resistance. This is the only
way to assure that measuring error lies within the
guaranteed range.
023.2
°C
RTD Measuring Range
Pt100 –200.0 … +200.0 °C
+200.0 … +850.0 °C
Pt1000 – 100.0 … +200.0 °C
+200.0 … +850.0 °C
°C
FUNC
brief
(Z3409)
30 Ω→°C
A cable resistance of 100 mΩ is compensated for automatically .
Compensation of Sensor Cable Resistances of up to 50 Ω
000.1
Ω
°C
+
DATA
MIN / MAX
brief
MAN
AUTO
brief
↑
↓
+ 1 digit
– 1 digit
FUNC
brief
GOSSEN METRAWATT GMBH 13
12 RS 232C Interface (with METRAHit ONE Plus only)
The multimeter is equipped with an RS 232C serial interface
for the transmission of measurement data to electronic data
processing systems. Measured data are transferred optically
through the instrument housing by means of infrared light to
an interface adapter (accessory), which is attached to the
multimeter. Data are then transferred to the computer via a
cable.
Activating the Interface
➭ While switching the instrument on, simultaneously press
the ON/OFF (2) and DATA-MIN/MAX (3) keys.
Automatic instrument shutdown is disabled after the
interface has been activated. The symbol (8) blinks at
the LCD (1) in order to indicate this condition.
The DATA function cannot be activated.
➭ Setup in METRAwin
10:
... device type / METRAHit12S-18S
Accessory Interface Packs
Interface adapters without memory allow for the transmission
of measurement data to a PC (single-channel pack).
Memory adapters also allow for on-site storage of
measurement data without a PC, and subsequent
downloading to a PC. Up to ten multimeters can be
interconnected off-line for the creation of a high performance
measuring system. Up to six multimeters can be connected
to a PC for online operation via memory adapters (single-
channel or 4-channel memory pack).
All interface packs include adapters, all necessary connector
cables and METRAwin
10/METRAHit
data logging and
analysis software with operating instructions.
METRAwin
10 Software
METRAwin
10 software is used to process and display
measurement data at a PC. Sampling can be triggered
manually with an adjustable sampling interval, or in a signal
dependent fashion. Storage of data in ASCII format can be
controlled with two trigger thresholds per measuring channel,
as well as by means of system time.
Hardware
Requirements
– IBM compatible Windows PC, Pentium CPU or better
with at least 64 MB RAM
–VGA monitor
– Hard disk with at least 40 MB available memory
– 3½" floppy disk drive for 1.4 MB floppies and a CD drive
– Microsoft compatible mouse
– If print-outs are required: a Windows supported printer
– 1 serial interface: COM1 or COM2
Software
Requirements
– MS Windows 95, 98, ME, NT, 2000* or XP*
* With memory adapter only
14 GOSSEN METRAWATT GMBH
13 Characteristic Values
1)
At 0 °C ... + 40 °C
2)
With zero balancing, + 35 digits without zero balancing
3)
Without sensor
4) 12 A 5 minutes, 16 A 30 seconds
Key
rdg. = reading (measured value)
d = digit
Meas.
Function
Measuring Range
Reso-
lution
Input Impedance
Intrinsic Error at Max. Resolution
under Reference Conditions
Overload Capacity
1)
Meas.
Function
±(... % rdg. + ... d) ±(... % rdg. + ... d)
3000 Value Time
V
30 mV 10 µV>10GΩ //<40pF 10MΩ // < 40 pF 0.5 + 3 —
600 V
DC
AC
eff
sine
Cont.
V
300 mV 100 µV>10GΩ //<40pF 10MΩ // < 40 pF 0.5 + 3 —
3V 1mV11MΩ //<40pF 11MΩ // < 40 pF 0.5 + 3
1 + 3
30 V 10 mV 10 MΩ //<40pF 10MΩ // < 40 pF 0.5 + 3
300 V 100 mV 10 MΩ //<40pF 10MΩ // < 40 pF 0.5 + 3
600 V 1 V 10 MΩ //<40pF 10MΩ // < 40 pF 0.5 + 3
Voltage drop at approx. range limit
A
300 µA 100 nA 15 mV — 1.0 + 5 (> 10 d)
0.36 A Cont.
A
3mA 1µA 150 mV 150 mV 1.0 + 2 1.5 + 2 (> 10 d)
30 mA 10 µA 650 mV — 1.0 + 5 (> 10 d) —
300 mA 100 µA 1 V 1 V 1.0 + 2 1.5 + 2 (> 10 d)
3 A 1 mA 100 mV — 1.0 + 5 (> 10 d) —
10 A
4)
Cont.
10 A 10 mA 270 mV 270 mV 1.0 + 2 1.5 + 2 (> 10 d)
Open-circuit voltage
Meas. current at
range limit
±(... % rdg. + ... d)
Ω
30 Ω 10 mΩ max. 3.2 V max. 250 µA 0.7 + 3
2)
600 V
DC
AC
eff
sine
max. 10 s
Ω
300 Ω 100 mΩ max. 3.2 V max. 250 µA 0.7 + 3
3kΩ 1 Ω max. 1.25 V max. 45 µA 0.7 + 3
30 kΩ 10 Ω max. 1.25 V max. 4.5 µA 0.7 + 3
300 kΩ 100 Ω max. 1.25 V max. 1.5 µA 0.7 + 3
3MΩ 1kΩ max. 1.25 V max. 150 nA 0.7 + 3
30 MΩ 10 kΩ max. 1.25 V max. 15 nA 2.0 + 3
2 V 1 mV max. 3.2 V 0.5 + 3
°C
Pt100
–200.0 ...
+200.0°C
0.1 °C
2 K + 5 D
3)
600 V
DC / AC
eff
sine
max. 10 s
°C
+200.0 ...
+850.0 °C
1.0 + 5
3)
Pt1000
–100.0 ...
+200.0°C
2 K +2 D
3)
+200.0 ...
+850.0 °C
1.0 + 2
3)
GOSSEN METRAWATT GMBH 15
Influencing Quantities and Influence Error
1) For temperature: specified error valid starting with temperature changes as of
10 K.
For frequency: specified error valid starting with display values as of 300 digits.
2) With zero balancing
3) After the symbol appears at the display
Response Time (after manual range selection)
Influencing
Quantity
Sphere of Influence
Measured Quantity /
Measuring Range
Influence Error
1)
±(... % rdg. + ... digits)
Tempera-
ture
0 °C ... +21 °C
and
+25 °C ... +40 °C
30/300 mV 1.0 + 3
3 ... 300 V 0.15 + 1
600 V 0.2 + 1
V0.4+2
300 µA ...
300 mA
0.5 + 1
3A/10A 0.5+1
A 0.75 + 1
30 Ω
2)
0.15 + 2
300 Ω 0.25 + 2
3kΩ ... 3 MΩ 0.15 + 1
30 MΩ 1.0 + 1
– 200 ... + 200 °C 0.5 K + 2
+ 200 ... + 850 °C0.5 + 2
Measured
Quantity
Frequency
> 65 Hz ... 400 Hz
3 ... 600 V
2.0 + 3
> 400 Hz ... 1 kHz 2.0 + 3
> 65 Hz ... 1 kHz A 2.0 + 3
Influen-
cing
Quantity
Sphere of
Influence
Measured
Quantity /
Measuring
Range
Influence Error
Battery
Voltage
3)
... < 7.9 V
> 8.1 V ... 10.0 V
V ± 2digits
V ± 4digits
A ± 4digits
A ± 6digits
30 Ω / 300 Ω /
°C
± 4digits
3kΩ ... 30 MΩ±3digits
Relative
Humidity
75%
3 days
instrument off
V
A
Ω
°C
1 x intrinsic error
DATA — ± 1digits
MIN /
MAX
—V, A ± 2digits
Influencing
Quantity
Sphere of Influence
Measuring
Range
Damping
Common
Mode
Interference
Voltage
Interference quantity max. 600 V V > 120 dB
Interference quantity max. 600 V
50 Hz, 60 Hz sine
3V ,
30 V
>80dB
300V >70dB
600 V > 60 dB
Series Mode
Interference
Voltage
Interference quantity: V ,
respective nominal value
of the measuring range,
max. 600 V , 50 Hz, 60 Hz
sine
V > 50 dB
Interference quantity max. 600 V V > 110 dB
Measured
Quantity /
Measuring
Range
Response Time
Measured Quantity
Step Function
Analog Display Digital Display
V, V,
A, A
0.7 s 1.5 s
from 0 to 80%
of the upper range limit
30 Ω...3MΩ 1.5 s 2 s
from ∞ to 50%
of the upper range limit
30 MΩ 4s 5s
0.7 s 1.5 s
°C max. 1 ... 3 s
from 0 to 50%
of the upper range limit
16 GOSSEN METRAWATT GMBH
Reference Conditions
Ambient temperature + 23 °C ± 2K
Relative humidity 40 % ... 60 %
Measured quantity
frequency 45 Hz ... 65 Hz
Measured quantity
waveshape sinusoidal
Battery voltage 8 V ± 0.1 V
Display
LCD panel (65 mm x 30 mm) with analog and digital display
including unit of measure, type of current and various special
functions
Analog
:
Display LCD scale with pointer
Scale length 55 mm for V and A ,
47 mm in for other ranges
Scaling 5 ... 0 ... ± 30 with 35 scale
divisions for , 0 ... 30 with 30
scale divisions in all other ranges
Polarity display With automatic switching
Overflow display Triangle (13)
Measuring rate 20 measurements per second, 10
measurements per second for Ω
Digital
:
Display / char. height 7-segment characters / 15 mm
Number of places 3¾-place 3100 steps
Overflow display “OL” appears
Polarity display “–” sign is displayed if plus pole is
connected to “⊥”
Measuring rate 2 measurements per second, 1
measurement per second for Ω
and °C
Power Supply
Battery 9 V flat-cell battery,
zinc carbon battery per IEC6F22,
alkaline manganese per IECLR6 or
equivalent rechargeable NiCd
battery
Service life With alkaline manganese:
approx. 750 hours for V , A
approx. 200 hours for V , A
Times 0.7 for interface operation
Battery test is displayed automatically if
battery voltage drops to below
approx. 7 V.
Electrical Safety
Safety class II per IEC 61010-1/EN 61010-1/
VDE 0411-1
Overvoltage category CAT III
Nominal voltage 600 V
Fouling factor 2
Test voltage 5.2 kV~ per IEC 61010-1/
EN 61010-1
1.0
0.8
0.6
0.4
0.2
0
0 1000
2000 3000
Digit / digits
30 MΩ
3MΩ
300 kΩ
30 kΩ
300 Ω
3kΩ
30 Ω
Measuring Voltage During Resistance Measurement
Voltage U
x
at measured resistance Rx relative to measuring
range and display
U
x
V
U
x
V
00.5
1
1.5 2
0.5
1.0
1.5
2.0
Measuring Current During Diode and Continuity Testing
Measuring current I
x
relative to displayed voltage value U
x
for the device under test
I
x
mA
GOSSEN METRAWATT GMBH 17
Electromagnetic Compatibility (EMC)
Interference emission EN 61326:2002 class B
Interference immunity
EN 61326:2002
IEC 61000-4-2: 1995/A1:1998
Feature A:
8 kV atmospheric discharge
4 kV contact discharge
IEC 61000-4-3:1995/A1:1998
Feature B:
3V/m
Fuses
Fuse links for all
ranges up to 300 mA FF(UR) 1.6 A/700 V;
6.3 mm
x
32 mm,
switching capacity: 50 kA at
700 V~ with ohmic load, protects
all current measuring ranges up to
300 mA in combination with power
diodes
Fuse links for all
ranges up to 10 A FF(UR) 16 A/600 V;
10 mm
x 38 mm,
switching capacity: 100 kA at
600 V with ohmic load, protects
3 A and 10 A ranges to 600 V
Refer to chapter 14,
“Maintenance”, regarding fuse
manufacturers and types.
Interface
Type RS 232C, serial
Data transmission Optical via infrared light through the
housing
Baud rate 8192 bits per second
Ambient Conditions
Accuracy range 0 °C ... + 40 °C
Operating temperature –10 °C ... + 50 °C
Storage temperature – 25 °C ... + 70 °C without batteries
Relative humidity 45 ... 75%, no condensation
allowed
Elevation to 2000 m
Deployment Indoors only, except within
specified ambient conditions
Mechanical Design
Protection IP 40,
IP 20 at the connector jacks
per DIN VDE 0470 part 1 /
EN 60529
Dimensions 84 mm x 195 mm x 35 mm
Weight approx. 350 gr. with battery
18 GOSSEN METRAWATT GMBH
14 Maintenance
Attention!
!
Disconnect the instrument from the measuring circuit
before opening to replace batteries or fuses!
14.1 Battery
Make sure that no battery leakage has occurred before initial
start-up, and after long periods of storage. Continue to
inspect the batteries for leakage at short, regular intervals.
If battery leakage has occurred, carefully and completely
clean the electrolyte from the instrument with a damp cloth,
and replace the batteries before using the instrument.
If the symbol (17) appears at the display (1), the batteries
should be replaced as soon as possible. You can continue
working with the instrument, but reduced measuring
accuracy may result.
The instrument requires one 9 V flat-cell battery in
accordance with IEC 6 F 22 or IEC 6 LR 61, or equivalent
rechargeable battery.
Replacing the Battery
➭ Set the instrument face down onto a flat working surface,
loosen the two screws at the back and lift off the housing
base, starting at the bottom. The housing top and
housing base are held together with the help of snap
hooks at the top front.
➭ Remove the batteries from the battery compartment and
carefully disconnect the snap contacts from the battery.
➭ Snap the contacts onto a new 9 V battery and insert it
into the battery compartment.
➭ Important for reassembly: First set the housing base onto
the housing top and align accurately (see photo below).
Then press the two housing halves together, first at the
bottom front (a), and then at the top front (b).
➭ Secure the housing base with the two screws.
➭ Please dispose of depleted batteries in accordance with
environmental protection regulations!
14.2 Fuses
If one of the fuses blows, this condition is displayed at the
LCD as soon as a measured quantity with a voltage of greater
than 4 V is applied to the corresponding connector jacks.
FUSE appears at the digital display (9) in this case.
The 16 A fuse interrupts the 3 A and 10 A ranges, and the
1.6 A fuse interrupts all other current measuring ranges. All
other measuring ranges remain functional.
If a fuse should blow, eliminate the cause of overload before
placing the instrument back into service!
Replacing the Fuse
➭ Open the instrument as described under “Replacing the
Battery”.
➭ Remove the blown fuse with the help of an abject such
as a test probe, and replace it with a new fuse.
The following fuses are approved for use:
– For current measuring ranges up to 300 mA:
Type FF(UR) 1.6 A / 700 V AC (50 kA),
6.3 mm x 32 mm
– For 3 A and 10 A current measuring ranges:
Attention!
!
Use specified fuses only! If fuses with other blowing
characteristics, other current ratings or other
breaking capacities are used, the operator is placed
in danger, and protective diodes, resistors and other
components may be damaged.
The use of repaired fuses or short-circuiting the fuse holder is
prohibited.
14.3 Housing
No special maintenance is required for the housing. Keep
outside surfaces clean. Use a slightly dampened cloth for
cleaning. Avoid the use of cleansers, abrasives and solvents.
(b) (a)
Manufacturer Type Dimensions
Siba FF Ultrarapid 16 A / 600 V ~ 100 kA 10 mm x 38 mm
GOSSEN METRAWATT GMBH 19
15 Repair and Replacement Parts Service,
DKD Calibration Lab* and Rental Instrument Service
If required please contact:
GOSSEN METRAWATT GMBH
Service Center
Thomas-Mann-Str. 20
90471 Nürnberg, Germany
Phone +49-(0)-911-8602-0
Fax +49-(0)-911-8602-253
e-mail [email protected]
This address is only valid in Germany.
Please contact our representatives or subsidiaries for service
in other countries.
* Calibration Laboratory for Electrical Quantities
DKD – K – 19701 accredited per DIN EN ISO/IEC 17025
Accredited quantities: direct voltage, direct current value, direct
current resistance, alternating voltage, alternating current value,
alternating current active power, alternating current apparent power,
DC power, capacitance, frequency
Competent Partner
GOSSEN METRAWATT GMBH is certified in accordance with
DIN EN ISO 9001:2000.
Our DKD calibration lab is accredited by the Physikalisch-
Technischen Bundesanstalt (German Federal Institute of
Physics and Metrology) and the Deutscher Kalibrierdienst
(German Calibration Service) in accordance with DIN EN ISO/
IEC 17025 under registration number DKD–K–19701.
We offer a complete range of expertise in the field of
metrology: from test reports and factory calibration certificates,
right on up to DKD calibration certificates.
Our spectrum of offerings is rounded out with free test
equipment management.
Our DKD calibration laboratory is part of our service department.
If errors are discovered during calibration, our specialized
personnel are capable of completing repairs using original
replacement parts.
As a full service calibration lab, we can calibrate instruments
from other manufacturers as well.
DKD Calibration Certificate Reprints (upon request)
If you order a DKD calibration certificate reprint for your
instrument, please provide us with the reference numbers
indicated in the upper and lower most fields of the calibration
seal. We do not need the instrument’s serial number.
16 Guarantee
All METRAHit
measuring and calibration instruments are
guaranteed for a period of 3 years after date of shipment.
Calibration is guaranteed for a period of 12 months. The
guarantee covers materials and workmanship. Damages
resulting from use for any other than the intended purpose or
operating errors, as well as any and all consequential
damages, are excluded.
17 Product Support
If required please contact:
GOSSEN METRAWATT GMBH
Product Support Hotline
Phone +49-(0)-911-8602-112
Fax +49-(0)-911-8602-709
e-mail support@gmc-instruments.com
Printed in Germany • Subject to change without notice
GOSSEN METRAWATT GMBH
Thomas-Mann-Str. 16-20
90471 Nürnberg • Germany
Phone: +49-(0)-911-8602-0
Fax: +49-(0)-911-8602-669
E-Mail [email protected]
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Gossen MetraWatt METRAHIT ONE Plus Operating instructions

Gossen MetraWatt
Brand
Gossen MetraWatt
Model
METRAHIT ONE Plus
Category
Measuring, testing & control
Type
Operating instructions
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